91443431 has 2 divisors, whose sum is σ = 91443432. Its totient is φ = 91443430.

The previous prime is 91443419. The next prime is 91443433. The reversal of 91443431 is 13434419.

It is a strong prime.

It is an emirp because it is prime and its reverse (13434419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91443431 - 2⁶ = 91443367 is a prime.

It is a super-2 number, since 2×91443431² = 16723802146103522, which contains 22 as substring.

Together with 91443433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91443394 and 91443403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91443433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45721715 + 45721716.

It is an arithmetic number, because the mean of its divisors is an integer number (45721716).

Almost surely, 2^91443431 is an apocalyptic number.

91443431 is a deficient number, since it is larger than the sum of its proper divisors (1).

91443431 is an equidigital number, since it uses as much as digits as its factorization.

91443431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 29.

The square root of 91443431 is about 9562.6058686950. The cubic root of 91443431 is about 450.5235568816.

The spelling of 91443431 in words is "ninety-one million, four hundred forty-three thousand, four hundred thirty-one".